CN111682703B - Rotating diode state monitoring system and method for brushless excitation system - Google Patents
Rotating diode state monitoring system and method for brushless excitation system Download PDFInfo
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- CN111682703B CN111682703B CN202010414968.4A CN202010414968A CN111682703B CN 111682703 B CN111682703 B CN 111682703B CN 202010414968 A CN202010414968 A CN 202010414968A CN 111682703 B CN111682703 B CN 111682703B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/04—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for rectification
- H02K11/042—Rectifiers associated with rotating parts, e.g. rotor cores or rotary shafts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
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Abstract
The invention relates to the technical field of generators of nuclear power stations and auxiliary systems thereof, and provides a rotating diode state monitoring system and a rotating diode state monitoring method for a brushless excitation system. The two groups of monitoring sensors respectively monitor the rotating diodes of the positive rectifying ring and the negative rectifying ring in the rotating rectifier so as to obtain two groups of diode state signals. The MARK keyway monitoring probe monitors rotor position information to obtain a key phase signal. And the state monitoring device judges the fault state of each rotating diode in the brushless excitation system and the relative position information of the rotating diode and the MARK key slot according to the diode state signal and the key phase signal. Because the position of the MARK key slot of the rotor and the position of the rotating diode in the brushless excitation system are relatively fixed, the position of each rotating diode is synchronized by monitoring MARK key slot position signals, so that the fault information of the rotating diodes can be monitored on line, and the position information of the fault rotating diodes relative to the MARK key slot of the rotor can be confirmed.
Description
Technical Field
The invention relates to the technical field of generators of nuclear power stations and auxiliary systems thereof, in particular to a rotating diode state monitoring system and method for a brushless excitation system.
Background
In the field of large-capacity generator sets, as the click capacity of a generator is increased, the current of a rotor is greatly increased, and the rotor slip ring of a brush excitation system needs to pass through large current, so that the serious heating problem and the brush abrasion problem can be caused, and the slip ring becomes a weak link in the system. The brushless exciter has the advantages that the armature of the brushless exciter and the rotor of the generator rotate coaxially, the rotating diode arranged on the generator shaft is used for rectifying to convert alternating current in the armature winding of the exciter into direct current for output, the excitation of the generator is realized, the brushless exciter is very suitable for a large-capacity unit, rotating contact elements such as carbon brushes, slip rings and the like in a static excitation mode are eliminated in the brushless excitation mode, the brushless exciter is compact in structure, the problems of heating and abrasion caused by sliding contact are solved, the problem of motor winding pollution caused by carbon powder and copper powder is also solved, the insulating service life can be prolonged, sparks are not easy to generate, and the brushless exciter has advantages in large and medium-sized units or small and medium-sized exciter units with complex working condition environments. However, since the rotating diode rectifying device is in a high-speed rotation state, and the voltage, current and other electrical quantities of the rotating diode rectifying device cannot be directly measured, the rotating diode rectifying device cannot be monitored by a conventional direct measurement means, and the monitoring of the rotating diode is difficult, which always hinders the development of the brushless excitation technology, and therefore how to effectively monitor the rotating rectifier is a problem that needs to be solved in the development of the brushless excitation technology.
Disclosure of Invention
The present application discloses a rotating diode condition monitoring system and method for a brushless excitation system that has enabled online monitoring of the rotating diodes of a rotating rectifier and determination of positional information of the rotating diodes that fail.
According to a first aspect, there is provided in one embodiment a rotating diode condition monitoring system for a brushless excitation system, comprising:
the two groups of monitoring sensors are arranged on the inner side of a stator of the brushless excitation system and are used for respectively monitoring the rotating diodes of a positive rectifying ring and a negative rectifying ring in the rotating rectifier of the brushless excitation system so as to obtain diode state signals; the diode state signal is related to the induced current flowing through the rotating diode when the rotating rectifier is driven to rotate by the rotor of the brushless excitation system; each group of monitoring sensors comprises three rotating diode monitoring sensors which are respectively the same in distance from the axis of the rotor and are positioned on the vertical section of the same axis;
a MARK keyway monitoring probe disposed inside the stator for monitoring a MARK keyway of the rotor, such that the MARK keyway monitoring probe outputs a key phase signal when the MARK keyway rotates with the rotor past a position of the MARK keyway monitoring probe; wherein the position of the MARK key slot and each of the rotating diodes in the rotating rectifier is unchanged and rotates synchronously with the rotor;
and the state monitoring device is used for acquiring the diode state signal sent by each rotating diode monitoring sensor and the key phase signal sent by the MARK key groove monitoring probe, and judging the fault state of the rotating diode and the position relation of the rotating diode which has a fault relative to the MARK key groove according to the diode state signal and the key phase signal.
Further, the state monitoring device comprises a signal preprocessing circuit, which is used for filtering the acquired diode state signal and the key phase signal to eliminate interference signals.
Further, the state monitoring device includes a delay processing circuit, which is configured to perform delay processing on the diode state signals sent by each group of the monitoring sensors, and synchronize the diode state signals obtained by the other two rotating diode monitoring sensors according to the time of the diode state signals obtained by the same rotating diode of the three rotating diode monitoring sensors, with the diode state signal obtained by one rotating diode monitoring sensor in each group of the monitoring sensors as a reference;
the signal preprocessing circuit is also used for carrying out delay processing on the key phase signal so as to synchronize the key phase signal with the diode state signal acquired by the reference rotating diode monitoring sensor.
Further, the state monitoring device comprises a signal merging circuit, which is used for merging the diode state signals acquired by each group of the monitoring sensors after delay processing and the key phase signals into two diode monitoring signals respectively.
Further, the state monitoring device further comprises a judging circuit, which is used for judging the fault state of the rotating diode and the position relation of the rotating diode which has faults relative to the MARK key groove according to the waveforms of the two diode monitoring signals. .
According to a second aspect, an embodiment provides a rotating diode state monitoring method for a brushless excitation system, comprising:
monitoring a rotating diode of a rectifying ring in a rotating rectifier of the brushless excitation system by using three rotating diode monitoring sensors to obtain three diode state signals; the diode state signal is related to induced current flowing through the rotating diode when the rotating rectifier is driven to rotate by the rotor of the brushless excitation system, and the three rotating diode monitoring sensors are respectively the same in distance from the axis of the rotor and are positioned on the vertical section of the same axis;
monitoring a MARK keyway of the rotor with a MARK keyway monitoring probe to output a key phase signal when the MARK keyway rotates with the rotor past a location of the MARK keyway monitoring probe; wherein the position of the MARK key slot and each of the rotating diodes in the rotating rectifier is unchanged and rotates synchronously with the rotor;
and judging the fault state of the rotating diode of the rectifying ring and the position relation of the rotating diode which has a fault relative to the MARK key groove according to the diode state signal and the key phase signal.
Further, the determining the fault state of the rotating diode of the rectifier ring and the positional relationship of the rotating diode with the fault relative to the MARK key slot according to the diode state signal and the key phase signal includes:
and filtering the three diode state signals and the key phase signal to eliminate interference signals.
Further, still include:
taking the diode state signal acquired by one rotating diode monitoring sensor as a reference, and synchronizing the diode state signals acquired by the other two rotating diode monitoring sensors according to the time of the diode state signals acquired by the three rotating diode monitoring sensors due to the same rotating diode;
synchronizing the key phase signal with the diode status signal acquired by the rotating diode monitoring sensor referenced.
Further, still include:
and combining the three delayed diode state signals and the key phase signal into a diode monitoring signal.
Further, still include:
and judging the fault state of the rotating diode of the rectifier ring and the position relation of the rotating diode which has a fault relative to the MARK key groove according to the waveform of the diode monitoring signal.
The rotating diode state monitoring system and the rotating diode state monitoring method for the brushless excitation system according to the embodiment comprise two groups of monitoring sensors, a MARK key groove monitoring probe and a state monitoring device. The two groups of monitoring sensors respectively monitor the two groups of monitoring sensors of the rotating diodes of the positive rectifying ring and the negative rectifying ring in the rotating rectifier so as to respectively acquire state signals of the two groups of diodes. And the MARK key groove monitoring probe monitors the MARK key groove position information of the rotor. And the state monitoring device judges the fault state of each rotating diode in the brushless excitation system and the relative position information of the rotating diode and the MARK key slot according to the diode state signal and the key phase signal. Because the position of the MARK key slot of the rotor and the position of each rotating diode in the brushless excitation system are relatively fixed, the position of each rotating diode is synchronized by monitoring MARK key slot position signals, so that the fault information of the rotating diodes can be monitored on line, and the position information of the fault rotating diodes relative to the MARK key slot of the rotor can be confirmed.
Drawings
FIG. 1 is a schematic diagram of a rotating rectifier of a brushless excitation system;
FIG. 2 is a schematic diagram of a rotating diode status monitoring system for a brushless excitation system in one embodiment;
FIG. 3 is a block diagram of a rotating diode status monitoring system in one embodiment;
FIG. 4 is a schematic diagram of a condition monitoring device according to an embodiment;
FIG. 5 is a diagram illustrating a diode status signal and a key phase signal according to an exemplary embodiment;
FIG. 6 is a waveform diagram of the diode status signal after synchronization by the delay processing circuit in one embodiment;
FIG. 7 is a waveform illustrating a combination of a diode status signal and a key phase signal according to an embodiment;
FIG. 8 is a flow diagram illustrating a method for monitoring the status of a rotating diode used in a brushless excitation system, according to one embodiment;
fig. 9 is a schematic diagram illustrating a method for obtaining a fault state of a rotating diode according to an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 1, a schematic diagram of a rotating rectifier of a brushless excitation system includes a main exciter armature, a main exciter ac connection line, a generator field winding, a positive rectifier ring 11, and a negative rectifier ring 12. The positive rectifying ring 11 includes an a-phase anode rectifying circuit, a B-phase anode rectifying circuit, and a C-phase anode rectifying circuit, and the negative rectifying ring 12 includes an a-phase cathode rectifying circuit, a B-phase cathode rectifying circuit, and a C-phase cathode rectifying circuit. The rectifying circuit of the positive and negative rectifier rings comprises sets of diode assemblies, each diode assembly comprising a rotating diode 14 and a neon indicator light 15. Wherein, the positive rectifying ring 11 is provided with a MARK key slot 13. In the prior art, there are three main conventional detection methods for the rotating diode 14 of the rotating rectifier:
firstly, an indicator light frequency detection method is used for determining the damage condition of a rotary diode by observing the state of a fuse light-emitting tube (namely a neon indicator light 15) of each diode assembly on site, and the rotary diode is connected with the fuse light-emitting tube in series, so that the fault state of the rotary diode can be judged according to the light-emitting state of the fuse light-emitting tube, and then the light-emitting state of the fuse light-emitting tube is influenced by the fault state of the fuse light-emitting tube, so that the detection method is unreliable;
a harmonic armature method, according to the harmonic armature reaction principle, comparing the harmonic component generated in the excitation winding when the rotating diode element is out of phase with the harmonic component in normal state to determine the damage condition of the diode;
and thirdly, a direct detection method is adopted, wherein a sensor is arranged to sense the current flowing through each rotating diode and judge whether the diode is damaged or not in a counting mode.
The above three methods all have the following disadvantages:
firstly, fault diodes cannot be positioned on line, namely, the fault diodes can be positioned only by stopping the machine to detect all diodes one by one after the rotating diodes are disconnected;
secondly, the abnormality that the through-current capability of the rotary diode is deteriorated cannot be found in advance. That is, the rotary diode is not completely disconnected, but the current passing through the rotary diode is significantly smaller than that of the other rotary diodes, and in this case, the rotary diode needs to be inspected for connection tightness, contact integrity, and diode characteristics, and replaced if necessary, or an abnormal expansion may occur. However, the situation that the rotating diode fails due to incomplete disconnection needs to be positioned and detected online, and the result of the shutdown detection cannot ensure that the rotating diode does not have a fault even when the rotating diode is online, so that the online positioning of the fault state of the rotating diode is important.
In the embodiment of the application, MARK key slot position information of a rotor is monitored through a MARK key slot monitoring probe, and then the fault state of each rotating diode in the brushless excitation system and the relative position information of the rotating diode and the MARK key slot are judged by a state monitoring device according to a diode state signal and a key phase signal. Because the position of the MARK key slot of the rotor and the position of each rotating diode in the brushless excitation system are relatively fixed, the position of each rotating diode is synchronized by monitoring MARK key slot position signals, so that the fault information of the rotating diodes is monitored on line, the position information of the fault rotating diodes relative to the MARK key slot of the rotor can be confirmed, and the on-line positioning and fault state detection of the rotating diodes of the rotating rectifier are realized.
Example one
Referring to fig. 2, a schematic structural diagram of a rotating diode state monitoring system for a brushless excitation system in an embodiment includes two sets of monitoring sensors, a MARK key slot monitoring probe 16 and a state monitoring device. The two groups of monitoring sensors are arranged on the inner side of a stator of the brushless excitation system and are used for respectively monitoring the rotating diodes of the positive rectifying ring and the negative rectifying ring in the rotating rectifier of the brushless excitation system so as to obtain diode state signals. The diode state signal is related to the induced current flowing through the rotating diode when the rotor of the brushless excitation system drives the rotating rectifier to rotate. Each group of monitoring sensors comprises three rotating diode monitoring sensors, namely a first rotating diode monitoring sensor 17, a second rotating diode monitoring sensor 18 and a third rotating diode monitoring sensor 19, the distances from the rotating diode monitoring sensors to the axis of the rotor of the brushless excitation system are the same, and the rotating diode monitoring sensors are positioned on the vertical section of the axis line of the same rotor. The MARK keyway monitoring probe 16 is disposed inside the stator for monitoring the MARK keyway 13 of the rotor such that the MARK keyway monitoring probe 16 outputs a key phase signal as the MARK keyway 13 rotates with the rotor past the position of the MARK keyway monitoring probe 16. Wherein, MARK key slot 13 keeps the position of each rotating diode in the rotating rectifier unchanged and rotates synchronously with the rotor. The state monitoring device is used for acquiring a diode state signal sent by each rotating diode monitoring sensor and a key phase signal sent by the MARK key groove monitoring probe, and judging the fault state of the rotating diode and the position relation of the rotating diode with the fault relative to the MARK key groove 13 according to the diode state signal and the key phase signal.
Referring to fig. 3, a block diagram of a rotating diode status monitoring system in an embodiment includes two sets of monitoring sensors 20, a MARK key slot monitoring probe 30, and a status monitoring device 40. The two groups of monitoring sensors 20 are fixedly arranged on a stator of the brushless excitation system rotating rectifier or a bracket beside the rotating rectifier by utilizing the electromagnetic induction principle. In one embodiment, the two sets of monitoring sensors 20 include a rotating diode monitoring sensor which is a diode detection coil for acquiring an induced electrical signal generated by the rotating diode flowing through an induced current, specifically, when a current flows through a dc lead of the rotating diode and sweeps across the diode detection coil, a magnetic flux change is generated in the diode detection coil according to the electromagnetic induction principle, so as to generate a hall effect in the diode detection coil, thereby generating an induced potential at two ends of the diode detection coil, and as the rotating diode approaches and leaves the diode detection coil during the rotation, a pulse signal is generated, which is a diode state signal acquired by the diode detection coil. In order to ensure the accuracy of the analysis processing of the subsequent state monitoring device 40, the two sets of monitoring sensors 20 synchronously and continuously acquire the diode state signals acquired by the respective rotating diode monitoring sensors within a predetermined time period, that is, it is required to ensure that the signals acquired by the state monitoring device 40 from the respective rotating diode monitoring sensors are synchronous signals and continuous signals. The MARK keyway monitoring probe 30 is mounted on the stator of the brushless excitation system rotating rectifier or on a bracket next to the rotating rectifier. The MARK keyway monitoring probe 30 may determine the period T of rotor rotation by probing the MARK keyways. The MARK keyway monitoring probe and the two sets of monitoring sensors 20 monitor the MARK keyways synchronously and continuously acquire key phase signals within a preset time period. In one embodiment, the predetermined period of time is preset by the relevant personnel, which may be one period T or a continuous period of several periods T of exciter rotor rotation. The state monitoring device 40 is used for analyzing and processing the synchronously acquired diode state signal and key phase signal, and determining the fault state of the rotating diode and the position relation of the rotating diode relative to the MARK key slot 13.
In practical applications, the rotating diode is mainly divided into two states, one is a normal operating state (normal state), and the other is a fault state. The device for monitoring the state of the rotating diode comprises a real-time controller, wherein the real-time controller is connected with an upper computer, receives the presetting of various parameters by related workers through the upper computer, and controls corresponding modules according to the preset parameters, such as: and receiving the presetting of the collection time period by related workers, and controlling the collection of the diode state signal and the key phase signal according to the preset time period. For another example, the setting of the threshold value by the relevant staff is received, and the state of the rotating diode is determined according to the preset threshold value, it should be noted that the real-time controller is a core component of the rotating diode state monitoring device in the embodiment of the present invention, is used for controlling each module, and is connected to an upper computer and a corresponding relay, so as to implement output of signals and human-computer interaction, and further has functions of responding to button operation, setting a watchdog timer to prevent the brushless excitation system from crash, and the like.
The state monitoring device 40 may be a functional module in a real-time controller, and is mainly used for filtering and processing the acquired signal, analyzing a file, and determining a pulse loss to determine the state of the rotating diode.
Referring to fig. 4, a schematic structural diagram of a state monitoring device in an embodiment includes a signal preprocessing circuit 41, a delay processing circuit 42, a signal combining circuit 43, and a determining circuit 44. The signal preprocessing circuit is used for filtering the acquired diode state signal and the key phase signal so as to eliminate interference signals. The delay processing circuit 42 is configured to delay the diode state signals sent by each group of the monitoring sensors, and synchronize the diode state signals obtained by the other two rotating diode monitoring sensors according to the time of the diode state signals obtained by the three rotating diode monitoring sensors due to the same rotating diode, with the diode state signal obtained by one rotating diode monitoring sensor in each group of the monitoring sensors as a reference. The signal preprocessing circuit is also used for delaying the key phase signal so as to synchronize the key phase signal with the diode state signal acquired by the reference rotating diode monitoring sensor. The signal combination circuit 43 is configured to combine the diode state signal obtained by each group of the delayed monitoring sensors with the key phase signal into two diode monitoring signals. The judging circuit 44 is used for judging the fault state of the rotary diode and the position relation of the fault rotary diode relative to the MARK key groove according to the waveforms of the two diode monitoring signals.
Referring to fig. 5, a diagram of the diode status signals and the key phase signals is shown in an embodiment, where the upper three waveforms are the diode status signals obtained by the three rotating diode monitoring sensors in each set of monitoring sensors, and the lower waveform is the key phase signal, where the period of the signal is the period of the rotor rotation, and the pulse high level is the time when the MARK key slot passes through the MARK key slot monitoring probe.
Referring to fig. 6, a waveform diagram of the diode status signals after being synchronized by the delay processing circuit in an embodiment is shown, in which the diode status signals acquired by one of the three rotating diode monitoring sensors are taken as a reference, and the diode status signals acquired by the other two rotating diode monitoring sensors are synchronized according to the time of the diode status signals acquired by the three rotating diode monitoring sensors due to the same rotating diode. A rectifier ring comprises three rotating diode monitoring sensors, and in one embodiment, the spatial positions of the rotating diode monitoring sensors are arranged at a mechanical angle of 30 degrees, so that the positions of the rotating diodes reflected by the diode state signals of the three rotating diode monitoring sensors are different by 30 degrees. Therefore, taking the positive rectifier ring as an example, the first rotating diode monitoring sensor 17 delays the time required for the rotor to rotate by 60 ° for 3.33 ms, the second rotating diode monitoring sensor 18 delays the time required for the rotor to rotate by 30 ° for 1.67 ms, and the third rotating diode monitoring sensor 19 does not delay the waveform, and the delayed waveforms are superposed to obtain a waveform as if the waveforms of all 30 rotating diodes of the positive rectifier ring are detected by only one third rotating diode monitoring sensor 19.
Referring to fig. 7, a waveform diagram of a diode state signal and a key phase signal after combination according to an embodiment includes a diode state signal 72 and a key phase signal 71. In one embodiment, the state monitoring device compares and binary-converts the synchronously superimposed waveform with a preset threshold value, and the binary state value of the rotating diode with the wave head amplitude higher than the preset threshold value is "1", which indicates that the rotating diode is in a normal state. The binary state value of the rotating diode with the wave head amplitude value lower than the threshold value is '0', and the disconnection of the diode is indicated, so that the fault information of the rotating diode can be judged. The rotary rectifier is fixed on a rotor large shaft of the brushless excitation system, and a MARK key groove specially used for reflecting the position of the rotor is arranged on the rotor large shaft, and the position of the MARK key groove corresponds to the position of the circumference center of the rectification ring C-phase anode rectification circuit in the axial direction of the rotor large shaft. As shown in fig. 7, the pitch of the rotating diode elements of the same phase of the rectifying ring is the same, and the pitch of two adjacent diode elements between the phases is slightly wider than the pitch of the diode elements of the same phase. Thus, a waveform pattern of a group of ten wave heads appears in the waveform of the diode status signal 72. From the foregoing analysis, it can be seen that the key phase signal 71 appears pulsed in the middle of the C-phase rotating diode waveform, so that the key phase signal 71 appears pulsed in the C-phase, then in the a-phase and B-phase, and so on. The waveform of the failed spinning diode and the position of the occurrence of the pulse of the key phase signal 71 can be deduced from this, the position of the failed spinning diode relative to the MARK key slot position.
In one embodiment, the state monitoring device compares the diode state signal and the key phase signal obtained and combined in real time with the diode state signal and the key phase signal in the normal working state, and can judge the fault state of the rotating two tubes according to the comparison result. The fault states of the rotating diode comprise normal, fault and abnormal, and the abnormal means that the current capacity of the rotating diode is poor. The waveform after synchronous superposition can be compared with two preset threshold values through a state monitoring device, and when the amplitude of the wave head is higher than the first preset threshold value, the fault state of the rotating diode is normal. And when the amplitude of the wave head is lower than a second preset threshold value, the fault state of the rotating diode is a fault. And when the wave head amplitude is lower than the first preset threshold value and smaller than the second preset threshold value, the fault state of the rotating diode is abnormal.
In the embodiment of the application, MARK key slot position information of a rotor is monitored through a MARK key slot monitoring probe, and then the fault state of each rotating diode in the brushless excitation system and the relative position information of the rotating diode and the MARK key slot are judged by a state monitoring device according to a diode state signal and a key phase signal. Because the position of the MARK key slot of the rotor and the position of each rotating diode in the brushless excitation system are relatively fixed, the position of each rotating diode is synchronized by monitoring MARK key slot position signals, so that the fault information of the rotating diodes is monitored on line, the position information of the fault rotating diodes relative to the MARK key slot of the rotor can be confirmed, and the on-line positioning and fault state detection of the rotating diodes of the rotating rectifier are realized. The rotary diode state monitoring system disclosed by the application not only can visually display the fault state and the position of the rotary diode from the waveform, but also can position on line without stopping, and can judge and find the rotary diode in the abnormal state with poor characteristics in advance to prevent fault amplification, so that the problem that the rotary diode with poor characteristics cannot be positioned is solved, and field detection and angle measurement conversion are not needed.
Example two
Referring to fig. 8, a schematic flow chart of a method for monitoring a state of a rotating diode used in a brushless excitation system according to an embodiment of the present invention is shown, where the method further includes:
step 201, a diode state signal is obtained.
Three rotating diode monitoring sensors are adopted to monitor the rotating diode of a rectifying ring in a rotating rectifier of the brushless excitation system so as to obtain three diode state signals. The diode state signal is related to the induced current flowing through the rotating diode when the rotating rectifier is driven to rotate by the rotor of the brushless excitation system, and the three rotating diode monitoring sensors are respectively the same in distance from the axis of the rotor and are positioned on the vertical section of the same axis.
Step 202, a key phase signal is obtained.
And the MARK key groove monitoring probe is adopted to monitor the MARK key groove of the rotor, so that when the MARK key groove rotates along with the rotor and passes through the position of the MARK key groove monitoring probe, the MARK key groove monitoring probe outputs a key phase signal. Wherein, the position of MARK key slot and each rotating diode in the rotating rectifier is kept unchanged and rotates synchronously with the rotor.
Step 203, judge the fault state.
And judging the fault state of the rotating diode of the rectifier ring and the position relation of the rotating diode with the fault relative to the MARK key slot according to the diode state signal and the key phase signal.
Referring to fig. 9, a schematic diagram of an embodiment of a method for obtaining a fault state of a rotating diode includes:
step 2031, signal preprocessing.
And filtering the three diode state signals and the key phase signal to eliminate interference signals.
Step 2032, signal synchronization.
And taking the diode state signal acquired by one rotating diode monitoring sensor as a reference, and synchronizing the diode state signals acquired by the other two rotating diode monitoring sensors according to the time of the diode state signals acquired by the three rotating diode monitoring sensors due to the same rotating diode. The resynchronization key phase signal and the reference rotating diode monitor sensor acquire a diode status signal.
Step 2033, combine the signals.
And combining the three diode state signals after the delay processing and the key phase signal into a diode monitoring signal.
Step 2034, acquiring the fault status
And judging the fault state of the rotating diode of the rectifier ring and the position relation of the rotating diode with the fault relative to the MARK key groove according to the waveform of the diode monitoring signal. The fault states of the rotating diode comprise normal, fault and abnormal, and the abnormal means that the current capacity of the rotating diode is poor. By comparing the waveform after synchronous superposition with two preset threshold values, when the amplitude of the wave head is higher than the first preset threshold value, the fault state of the rotating diode is normal. And when the amplitude of the wave head is lower than a second preset threshold value, the fault state of the rotating diode is a fault. And when the wave head amplitude is lower than the first preset threshold value and smaller than the second preset threshold value, the fault state of the rotating diode is abnormal.
In the embodiment of the application, the rotating diode is not required to be stopped and then positioned, meanwhile, the characteristic of characteristic deterioration of the rotating diode can be found in advance, the rotating diode is required to be stopped and replaced after being positioned on line, the condition that the characteristic deterioration diode can be found after phase failure is effectively prevented, and the influences of positioning difficulty and fault amplification are solved.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (6)
1. A rotating diode condition monitoring system for a brushless excitation system, comprising:
the two groups of monitoring sensors are arranged on the inner side of a stator of the brushless excitation system and are used for respectively monitoring the rotating diodes of a positive rectifying ring and a negative rectifying ring in the rotating rectifier of the brushless excitation system so as to obtain diode state signals; the diode state signal is related to the induced current flowing through the rotating diode when the rotating rectifier is driven to rotate by the rotor of the brushless excitation system; each group of monitoring sensors comprises three rotating diode monitoring sensors which are respectively the same in distance from the axis of the rotor and are positioned on the vertical section of the same axis;
a MARK keyway monitoring probe disposed inside the stator for monitoring a MARK keyway of the rotor, such that the MARK keyway monitoring probe outputs a key phase signal when the MARK keyway rotates with the rotor past a position of the MARK keyway monitoring probe; wherein the position of the MARK key slot and each of the rotating diodes in the rotating rectifier is unchanged and rotates synchronously with the rotor;
the state monitoring device is used for acquiring the diode state signal sent by each rotating diode monitoring sensor and the key phase signal sent by the MARK key groove monitoring probe, and judging the fault state of the rotating diode and the position relation of the rotating diode with the fault relative to the MARK key groove according to the diode state signal and the key phase signal;
the state monitoring device comprises a signal preprocessing circuit, a signal processing circuit and a state detecting circuit, wherein the signal preprocessing circuit is used for filtering the acquired diode state signal and the key phase signal so as to eliminate interference signals;
the state monitoring device comprises a delay processing circuit, a delay processing circuit and a control circuit, wherein the delay processing circuit is used for respectively carrying out delay processing on the diode state signals sent by each group of monitoring sensors, and the diode state signals obtained by the other two rotating diode monitoring sensors are synchronized according to the time of the diode state signals obtained by the three rotating diode monitoring sensors due to the same rotating diode by taking the diode state signal obtained by one rotating diode monitoring sensor in each group of monitoring sensors as a reference;
the diode state signal is an induced electrical signal generated by the rotating diode flowing through an induced current;
the synchronizing the diode state signals acquired by the other two rotary diode monitoring sensors according to the time of the diode state signals acquired by the three rotary diode monitoring sensors due to the same rotary diode comprises:
synchronously and continuously acquiring the diode state signals acquired by the rotating diode monitoring sensors within a preset time period so as to ensure that the signals acquired from the rotating diode monitoring sensors are synchronous signals and continuous signals;
the signal preprocessing circuit is also used for carrying out delay processing on the key phase signal so as to synchronize the key phase signal with the diode state signal acquired by the reference rotating diode monitoring sensor.
2. The rotating diode condition monitoring system of claim 1, wherein the condition monitoring device comprises a signal combining circuit for combining the diode condition signals acquired by each set of the monitoring sensors after the delay processing with the key phase signals into two diode monitoring signals, respectively.
3. The rotating diode condition monitoring system of claim 2, wherein said condition monitoring device further comprises a determining circuit for determining a fault condition of said rotating diode and a positional relationship of said rotating diode in relation to said MARK key slot in which a fault has occurred, based on waveforms of two of said diode monitor signals.
4. A method for monitoring the condition of a rotating diode used in a brushless excitation system, comprising:
monitoring a rotating diode of a rectifying ring in a rotating rectifier of the brushless excitation system by using three rotating diode monitoring sensors to obtain three diode state signals; the diode state signal is related to induced current flowing through the rotating diode when the rotating rectifier is driven to rotate by the rotor of the brushless excitation system, and the three rotating diode monitoring sensors are respectively the same in distance from the axis of the rotor and are positioned on the vertical section of the same axis;
monitoring a MARK keyway of the rotor with a MARK keyway monitoring probe to output a key phase signal when the MARK keyway rotates with the rotor past a location of the MARK keyway monitoring probe; wherein the position of the MARK key slot and each of the rotating diodes in the rotating rectifier is unchanged and rotates synchronously with the rotor;
judging the fault state of the rotating diode of the rectifying ring and the position relation of the rotating diode with the fault relative to the MARK key groove according to the diode state signal and the key phase signal;
the judging the fault state of the rotating diode of the rectifier ring and the position relation of the rotating diode which has fault relative to the MARK key groove according to the diode state signal and the key phase signal comprises the following steps:
filtering the three diode state signals and the key phase signal to eliminate interference signals;
taking the diode state signal acquired by one rotating diode monitoring sensor as a reference, and synchronizing the diode state signals acquired by the other two rotating diode monitoring sensors according to the time of the diode state signals acquired by the three rotating diode monitoring sensors due to the same rotating diode;
the diode state signal is an induced electrical signal generated by the rotating diode flowing through an induced current;
the synchronizing the diode state signals acquired by the other two rotary diode monitoring sensors according to the time of the diode state signals acquired by the three rotary diode monitoring sensors due to the same rotary diode comprises:
synchronously and continuously acquiring the diode state signals acquired by the rotating diode monitoring sensors within a preset time period so as to ensure that the signals acquired from the rotating diode monitoring sensors are synchronous signals and continuous signals;
synchronizing the key phase signal with the diode status signal acquired by the rotating diode monitoring sensor referenced.
5. The rotating diode condition monitoring method of claim 4, further comprising:
and combining the three delayed diode state signals and the key phase signal into a diode monitoring signal.
6. The rotating diode condition monitoring method of claim 5, further comprising:
and judging the fault state of the rotating diode of the rectifier ring and the position relation of the rotating diode which has a fault relative to the MARK key groove according to the waveform of the diode monitoring signal.
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| CN1065684C (en) * | 1995-03-31 | 2001-05-09 | 埃科艾尔公司 | Hybrid alternator having voltage regutator |
| WO2004073135A2 (en) * | 2003-02-10 | 2004-08-26 | Briggs & Stratton Power Products Group, Llc | Monitoring system for a generator |
| US20050189479A1 (en) * | 2004-02-26 | 2005-09-01 | Wen-Wei Su | Detecting device for detecting the rotation of a motor rotor |
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| CN102005888A (en) * | 2010-10-09 | 2011-04-06 | 中科华核电技术研究院有限公司 | Branch state monitoring method and device of rotary rectifier |
| CN101995540B (en) * | 2010-10-09 | 2013-04-10 | 中科华核电技术研究院有限公司 | Method and device for monitoring status of rotating diode of magnetizing exciter |
| CN202057710U (en) * | 2011-03-02 | 2011-11-30 | 厦门永平堂静电工程有限公司 | Focusing positioning static voltage detector with infrared light emitting diode |
| US9154046B2 (en) * | 2013-02-22 | 2015-10-06 | Hamilton Sunstrand Corporation | Rotating rectifier assembly and method |
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